avi - This extension indicates a video file playable by most multimedia viewers including Microsoft's Media Player. .bmp - This extension indicates another image file that might have originated from Windows Paint program. .dll - This extension indicates a Dynamic Link Library which may contain additional programming code for software. " Of course, deleting files can be a scary adventure to most users. Most computer users don't know which files are safe to delete and which aren't. The worst thing anyone could do is snoop around crucial Window directories and haphazardly delete files that don't look familiar. Doing so could render important programs inoperable, corrupt the Windows operating system, and possibly prevent the computer from even starting. Options available can accommodate a person's preference for the display of numbers, currency, time, and date format. Sounds Properties. Multimedia fans can create a rich PC environment filled with sound through this setting. Sounds can be assigned to numerous events and they don't even need to be the default sounds installed by Windows. Fortunately, computer systems are designed in a way that even a child can manipulate them. In fact, if you can remember that most systems are designed along the line of menus and the selections of a few options on these menus, you'll do just fine no matter how many buttons there are to push. For example, when you're faced with an electronic system, look for a main menu. Fans of open source programs are adamant about reliable software and highly criticize commercialized versions for being buggy and error-prone. Avid fans even proclaim commercialism is the cause of shoddy software. Another benefit that open source brings to light is the speed at which its products are developed, enhanced, supported and distributed. The key is to understand what computer errors are, understand what they mean when they show up, and understand how to minimize their occurrence in the first place. Basically, computer errors are the result of a number of things that may or may not have anything to do with the way the computer is used.